/* 
 * Arm PrimeCell PL110 Color LCD Controller
 *
 * Copyright (c) 2005 CodeSourcery, LLC.
 * Written by Paul Brook
 *
 * This code is licenced under the GNU LGPL
 *
 * Framebuffer format conversion routines.
 */

#ifndef ORDER

#if BITS == 8
#define COPY_PIXEL(to, from) *(to++) = from
#elif BITS == 15 || BITS == 16
#define COPY_PIXEL(to, from) *(uint16_t *)to = from; to += 2;
#elif BITS == 24 
#define COPY_PIXEL(to, from) \
  *(to++) = from; *(to++) = (from) >> 8; *(to++) = (from) >> 16
#elif BITS == 32
#define COPY_PIXEL(to, from) *(uint32_t *)to = from; to += 4;
#else
#error unknown bit depth
#endif

#define ORDER 0
#include "pl110_template.h"
#define ORDER 1
#include "pl110_template.h"
#define ORDER 2
#include "pl110_template.h"

static drawfn glue(pl110_draw_fn_,BITS)[18] =
{
    glue(pl110_draw_line1_lblp,BITS),
    glue(pl110_draw_line2_lblp,BITS),
    glue(pl110_draw_line4_lblp,BITS),
    glue(pl110_draw_line8_lblp,BITS),
    glue(pl110_draw_line16_lblp,BITS),
    glue(pl110_draw_line32_lblp,BITS),

    glue(pl110_draw_line1_bbbp,BITS),
    glue(pl110_draw_line2_bbbp,BITS),
    glue(pl110_draw_line4_bbbp,BITS),
    glue(pl110_draw_line8_bbbp,BITS),
    glue(pl110_draw_line16_bbbp,BITS),
    glue(pl110_draw_line32_bbbp,BITS),

    glue(pl110_draw_line1_lbbp,BITS),
    glue(pl110_draw_line2_lbbp,BITS),
    glue(pl110_draw_line4_lbbp,BITS),
    glue(pl110_draw_line8_lbbp,BITS),
    glue(pl110_draw_line16_lbbp,BITS),
    glue(pl110_draw_line32_lbbp,BITS)
};

#undef BITS
#undef COPY_PIXEL

#else

#if ORDER == 0
#define NAME glue(lblp, BITS)
#ifdef WORDS_BIGENDIAN
#define SWAP_WORDS 1
#endif
#elif ORDER == 1
#define NAME glue(bbbp, BITS)
#ifndef WORDS_BIGENDIAN
#define SWAP_WORDS 1
#endif
#else
#define SWAP_PIXELS 1
#define NAME glue(lbbp, BITS)
#ifdef WORDS_BIGENDIAN
#define SWAP_WORDS 1
#endif
#endif

#define FN_2(x, y) FN(x, y) FN(x+1, y)
#define FN_4(x, y) FN_2(x, y) FN_2(x+2, y)
#define FN_8(y) FN_4(0, y) FN_4(4, y)

static void glue(pl110_draw_line1_,NAME)(uint32_t *pallette, uint8_t *d, const uint8_t *src, int width)
{
    uint32_t data;
    while (width > 0) {
        data = *(uint32_t *)src;
#ifdef SWAP_PIXELS
#define FN(x, y) COPY_PIXEL(d, pallette[(data >> (y + 7 - (x))) & 1]);
#else
#define FN(x, y) COPY_PIXEL(d, pallette[(data >> ((x) + y)) & 1]);
#endif
#ifdef SWAP_WORDS
        FN_8(24)
        FN_8(16)
        FN_8(8)
        FN_8(0)
#else
        FN_8(0)
        FN_8(8)
        FN_8(16)
        FN_8(24)
#endif
#undef FN
        width -= 32;
        src += 4;
    }
}

static void glue(pl110_draw_line2_,NAME)(uint32_t *pallette, uint8_t *d, const uint8_t *src, int width)
{
    uint32_t data;
    while (width > 0) {
        data = *(uint32_t *)src;
#ifdef SWAP_PIXELS
#define FN(x, y) COPY_PIXEL(d, pallette[(data >> (y + 6 - (x)*2)) & 3]);
#else
#define FN(x, y) COPY_PIXEL(d, pallette[(data >> ((x)*2 + y)) & 3]);
#endif
#ifdef SWAP_WORDS
        FN_4(0, 24)
        FN_4(0, 16)
        FN_4(0, 8)
        FN_4(0, 0)
#else
        FN_4(0, 0)
        FN_4(0, 8)
        FN_4(0, 16)
        FN_4(0, 24)
#endif
#undef FN
        width -= 16;
        src += 4;
    }
}

static void glue(pl110_draw_line4_,NAME)(uint32_t *pallette, uint8_t *d, const uint8_t *src, int width)
{
    uint32_t data;
    while (width > 0) {
        data = *(uint32_t *)src;
#ifdef SWAP_PIXELS
#define FN(x, y) COPY_PIXEL(d, pallette[(data >> (y + 4 - (x)*4)) & 0xf]);
#else
#define FN(x, y) COPY_PIXEL(d, pallette[(data >> ((x)*4 + y)) & 0xf]);
#endif
#ifdef SWAP_WORDS
        FN_2(0, 24)
        FN_2(0, 16)
        FN_2(0, 8)
        FN_2(0, 0)
#else
        FN_2(0, 0)
        FN_2(0, 8)
        FN_2(0, 16)
        FN_2(0, 24)
#endif
#undef FN
        width -= 8;
        src += 4;
    }
}

static void glue(pl110_draw_line8_,NAME)(uint32_t *pallette, uint8_t *d, const uint8_t *src, int width)
{
    uint32_t data;
    while (width > 0) {
        data = *(uint32_t *)src;
#define FN(x) COPY_PIXEL(d, pallette[(data >> (x)) & 0xff]);
#ifdef SWAP_WORDS
        FN(24)
        FN(16)
        FN(8)
        FN(0)
#else
        FN(0)
        FN(8)
        FN(16)
        FN(24)
#endif
#undef FN
        width -= 4;
        src += 4;
    }
}

static void glue(pl110_draw_line16_,NAME)(uint32_t *pallette, uint8_t *d, const uint8_t *src, int width)
{
    uint32_t data;
    unsigned int r, g, b;
    while (width > 0) {
        data = *(uint32_t *)src;
#ifdef SWAP_WORDS
        data = bswap32(data);
#endif
#if 0
        r = data & 0x1f;
        data >>= 5;
        g = data & 0x3f;
        data >>= 6;
        b = data & 0x1f;
        data >>= 5;
#else
        r = (data & 0x1f) << 3;
        data >>= 5;
        g = (data & 0x3f) << 2;
        data >>= 6;
        b = (data & 0x1f) << 3;
        data >>= 5;
#endif
        COPY_PIXEL(d, glue(rgb_to_pixel,BITS)(r, g, b));
        r = (data & 0x1f) << 3;
        data >>= 5;
        g = (data & 0x3f) << 2;
        data >>= 6;
        b = (data & 0x1f) << 3;
        data >>= 5;
        COPY_PIXEL(d, glue(rgb_to_pixel,BITS)(r, g, b));
        width -= 2;
        src += 4;
    }
}

static void glue(pl110_draw_line32_,NAME)(uint32_t *pallette, uint8_t *d, const uint8_t *src, int width)
{
    uint32_t data;
    unsigned int r, g, b;
    while (width > 0) {
        data = *(uint32_t *)src;
#ifdef SWAP_WORDS
        r = data & 0xff;
        g = (data >> 8) & 0xff;
        b = (data >> 16) & 0xff;
#else
        r = (data >> 24) & 0xff;
        g = (data >> 16) & 0xff;
        b = (data >> 8) & 0xff;
#endif
        COPY_PIXEL(d, glue(rgb_to_pixel,BITS)(r, g, b));
        width--;
        src += 4;
    }
}

#undef SWAP_PIXELS
#undef NAME
#undef SWAP_WORDS
#undef ORDER

#endif
